Bicycle lock



FIG. 1 is a perspective view of a bicycle lock;

FIG. 2 is a perspective view thereof with the shackle separated from the base;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a front elevation view thereof; and,

FIG. 8 is a rear elevation thereof.

The broken lines are included for the purpose of illustrating environmental features and form no part of the claimed design. 

CLAIM We claim the ornamental design for a bicycle lock, as shown and described. 